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i would say try running you 12 volt constant to the cig lighter fuse or somethings that always hot then run your switched to to the radio fuse and see if that helps you might need to get a new harness off of ebay if thay have one or just put a toggle switch on the radio to turn it off or on,

The harness looks like what is depicted on this link: http://cgi.ebay.com/JVC--16-PIN-WIRE-HARNESS-FOR-CD-PLAYER-BLACK-BRAND-NEW_W0QQitemZ370214069143QQcmdZViewItemQQimsxZ20090612?IMSfp=TL090612198008r8862 This
connector fits the following JVC Car Radio/CD/MP3 Players with
16 pin connection.
All wires are labeled.Hope this helps....................sodeep